Lightcurves in the observer’s frame of theoretical clouds for different parameter values of the jet emission region. In each panel, lightcurves in the γ-ray, X-ray, and R band are shown for the following different varied parameters: (a) magnetic field , and (b) size of the emission region, as well as (c) spectral index s′ of the electron distribution, and (d) the injection luminosity of the quiescent state. The black-dashed line marks the lightcurve employing the FSRQ parameters given in Table 1. We note the logarithmic y-axes.